Here is a three blade spinner for the Bf-109. This ARF came with a two bladed prop that just did not look correct because it wasn't. I used my profile gage to get the curvature correct and still have it mate to the backplate. One prototype was made for a check fit and a couple of dimensions adjusted and this version fit perfect then.

Hanger 9 64” Bf-109F-2
Motor: EFlite Power 90-325kv
Propellant: MAS 16x10x3

You will need to size the blade openings according to the prop you use. We used a Master Airscrew 16x10x3 three blade. The motor was happy with the load and the plane flies great and looks correct.

The spinner was wet sanded and then painted. It came out well and has the correct shape.